|Date|Pos.|Name|From|Fee|
|---|---|---|---|---|
|27 June 2007|DF|Aaron Hughes|Aston Villa|£1,000,000|
|5 July 2007|MF|Steven Davis|Aston Villa|£4,000,000|
|9 July 2007|FW|Diomansy Kamara|West Bromwich Albion|£6,000,000|
|12 July 2007|DF|Chris Baird|Southampton|£3,035,000|
|13 July 2007|FW|David Healy|Leeds United|£1,500,000|
|13 July 2007|DF|Paul Konchesky|West Ham|£3,250,000|
|19 July 2007|MF|Lee Cook|QPR|£2,500,000|
|4 August 2007|MF|Adrian Leijer|Melbourne Victory|Undisclosed|
|8 August 2007|DF|Hameur Bouazza|Watford|£3,000,000|
|23 August 2007|GK|Kasey Keller|Borussia Mönchengladbach|Free|
|30 August 2007|DF|Nathan Ashton|Unattached|Free|
|31 August 2007|FW|Shefki Kuqi|Crystal Palace|Loan|
|31 August 2007|MF|Danny Murphy|Tottenham Hotspur|Loan|
|31 August 2007|MF|Seol Ki-Hyeon|Reading|Undisclosed|
|31 August 2007|DF|Dejan Stefanovic|Portsmouth|£1,000,000|

Question: what is the number of dfs?
Answer: 6